Answer:
H₁: μd < 0
Step-by-step explanation:
Hello!
You have the hypothesis that drinking chocolate milk reduces the cholesterol level of people.
To one sample of 10 people, two variables were measured,
X₁: "Cholesterol level before drinking chocolate milk for two weeks"
X₂: "cholesterol level after drinking chocolate milk for two weeks"
The variable difference is "before minus after", symbolized: Xd= X₁ - X₂
If the consumption of chocolate milk reduces cholesterol levels, the levels measured for X₂ should be smaller than the measures of X₁, therefore, the difference between each pair of values should be negative as well as their population mean. Symbolically: μd < 0
- <em>Remember, the = sign is always in the null hypothesis. </em>
Then the hypotheses are determined as:
H₀: μd ≥ 0
H₁: μd < 0
I hope it helps!